Like many people, I live on the Earth. And like many people, I've recently become concerned with the size of my "carbon footprint" because of the cost of gasoline. In fact, I've become so concerned with the way my carbon footprint has been leaving its tracks across my credit-card bills, I've decided to explore alternative methods of transportation, such as having other people drive me.

"I thought we could carpool," I tell my daughter. "We could go to the grocer ...

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